Channel And 2 Channel Operation; Vox Configuration; Introduction - Bosch Plena LBB1990/00 System Manual

Plena Voice Alarm System | Basic System Manual | Configuration
4.5.11 1 channel and 2 channel
operation
4.5. 1 1. 1

Introduction

If the 2ch operation switch (see figure 4.1) is in the ON
position, the voice alarm controller operates in the
2-channel mode. If the 2ch operation switch is in the
OFF position, the voice alarm controller operates in the
1-channel mode.
4.5. 1 1.2 1-channel mode
In the 1-channel mode, all calls and BGM are amplified
by the internal power amplifier of the voice alarm
controller. If desired, an external power amplifier can
be connected for spare switching (see section 3.9). In 1-
channel mode, all calls will interrupt the BGM. The
external power amplifier is not supervised (see section
4.5.10).
table 4.4: 1-channel mode
Amplifier Function
Internal BGM/Call power amplifier
External Not connected/Spare power amplifier
4.5. 1 1.3 2-channel mode
In the 2-channel mode, the BGM is amplified by the
internal power amplifier of the voice alarm controller.
The calls are amplified by the external power amplifier,
which is connected to the voice alarm controller
(see section 3.9). If the external power amplifier is
faulty, the calls are amplified by the internal power
amplifier. In 2-channel mode, calls do not interrupt the
BGM. Both the internal power amplifier and the
external power amplifier are supervised (see section
4.5.10).
table 4.5: 2-channel mode
Amplifier
Internal
External
Bosch Security Systems | 2005-04 | 9922 141 10364en
Function
BGM/Spare power amplifier
Call power amplifier
4.6

VOX configuration

4.6.1 Introduction
The type of source that is connected to the mic/line
input with VOX functionality is set using the Mic/Line
switch on the rear of the voice alarm controller (see
figure 4.3).
• If the source is a microphone, put the switch in the
Mic position.
• If the source is a line-level source, put the switch in
the Line position.
Mic/Line
figure 4.3: VOX input source switch
The mic/line input with VOX functionality is
configured using DIP switches on the rear of the voice
alarm controller (see figure 4.4). By default, all switches
are in the OFF position.
Mic/Line
figure 4.4: VOX settings
The settings that can be made using the DIP switches
are explained in a table on the rear of the voice alarm
controller (see figure 4.5).
Off
1 VOX activate by mic.
2 Speech filter
3 Phantom power Off
figure 4.5: VOX settings table
en | 30
Vox
Speech filter
Phantom power
Off
On
Vox
Speech filter
Phantom power
Off
On
On
VOX activate by VOX Switch
Flat
Phantom power On